U.S. patent application number 11/313934 was filed with the patent office on 2006-07-06 for flat display apparatus.
This patent application is currently assigned to LG Electronics Inc.. Invention is credited to Tae soo Hwang, Bog ryong Kim, Byung Chul Lee.
Application Number | 20060146224 11/313934 |
Document ID | / |
Family ID | 36218133 |
Filed Date | 2006-07-06 |
United States Patent
Application |
20060146224 |
Kind Code |
A1 |
Lee; Byung Chul ; et
al. |
July 6, 2006 |
Flat display apparatus
Abstract
The present invention relates to a flat display apparatus, and
more particularly, the present invention relates to a flat display
apparatus which can prevent a misdischarge and enhance
productivity. The flat display apparatus according to the present
invention includes a display panel, a frame provided on a rear
surface of the display panel, and at least two thermal conductive
sheets placed between the display panel and the frame. The thermal
conductive sheets are spaced apart from each other at certain
intervals. According to the present invention, by improving the
structure of the flat display apparatus, the workability can be
enhanced and a temperature gradient of the flat display panel can
be suppressed.
Inventors: |
Lee; Byung Chul;
(Chungcheongnam-do, KR) ; Kim; Bog ryong;
(Gyeongsangbuk-do, KR) ; Hwang; Tae soo;
(Gyeongsangbuk-do, KR) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Assignee: |
LG Electronics Inc.
|
Family ID: |
36218133 |
Appl. No.: |
11/313934 |
Filed: |
December 22, 2005 |
Current U.S.
Class: |
349/58 |
Current CPC
Class: |
H05K 7/20963 20130101;
H01J 2217/492 20130101 |
Class at
Publication: |
349/058 |
International
Class: |
G02F 1/1333 20060101
G02F001/1333 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 23, 2005 |
KR |
10-2005-0014966 |
Feb 23, 2005 |
KR |
10-2005-0014967 |
Dec 23, 2004 |
KR |
10-2004-0111122 |
Claims
1. A flat display apparatus, comprising a display panel; a frame
provided at a rear surface of the display panel; and at least two
thermal conductive sheets located between the display panel and the
frame, the thermal conductive sheets being side-by-side and spaced
apart from each other.
2. The flat display apparatus as claimed in claim 1, wherein the
thermal conductive sheets have a smaller size than a size of the
display panel, whereby edges of the thermal conductive sheets are
spaced inwardly from an edge of the display panel.
3. The flat display apparatus as claimed in claim 1, wherein an
interval between the thermal conductive sheets is 0.1 mm to 5.0
mm.
4. The flat display apparatus as claimed in claim 1, wherein the
thermal conductive sheets have a thickness of 0.1 mm to 2.0 mm.
5. The flat display apparatus as claimed in claim 1, wherein the
thermal conductive sheets are arranged in the direction which is a
longitudinal direction or a widthwise direction of the frame.
6. The flat display apparatus as claimed in claim 1, wherein the
thermal conductive sheets are porous sheets.
7. The flat display apparatus as claimed in claim 6, wherein the
porous sheets contain a foaming agent.
8. The flat display apparatus as claimed in claim 7, wherein the
foaming agent comprises urethane foam.
9. The flat display apparatus as claimed in claim 6, wherein the
porous sheets contain silicon material.
10. The flat display apparatus as claimed in claim 1, wherein the
frame has one or more holes therein.
11. The flat display apparatus as claimed in claim 1, wherein the
thermal conductive sheets and the frame each have one or more holes
located therein.
12. The flat display apparatus as claimed in claim 11, wherein the
holes formed in the thermal conductive sheets are aligned with the
holes formed in the frame.
13. The flat display apparatus as claimed in claim 1, wherein the
display panel is a plasma display panel.
14. A flat display apparatus, comprising a display panel; a frame
provided at a rear surface of the display panel; and at least two
thermal conductive porous sheets located between the display panel
and the frame, the thermal conductive porous sheets being
side-by-side and spaced apart from each other, wherein an interval
between the thermal conductive porous sheets is 0.1 mm to 5.0
mm.
15. The flat display apparatus as claimed in claim 14, wherein the
porous sheets contain a foaming agent.
16. The flat display apparatus as claimed in claim 15, wherein the
foaming agent comprises urethane foam.
17. The flat display apparatus as claimed in claim 14, wherein the
porous sheets contain silicon material.
18. The flat display apparatus as claimed in claim 14, wherein the
frame has one or more holes therein.
19. The flat display apparatus as claimed in claim 14, wherein the
porous sheets and the frame each have one or more holes located
therein.
20. The flat display apparatus as claimed in claim 19, wherein the
holes formed in the porous sheets are aligned with the holes formed
in the frame.
21. The flat display apparatus as claimed in claim 14, wherein the
display panel is a plasma display panel.
22. A flat display apparatus, comprising a display panel; a frame
provided at a rear surface of the display panel, a first region of
the frame having one or more holes therein; and a thermal
conductive sheet located between the display panel and the frame,
wherein the thermal conductive sheet is located at the first region
of the frame.
23. The flat display apparatus as claimed in claim 22, wherein the
thermal conductive sheet is a porous sheet containing a foam
agent.
24. The flat display apparatus as claimed in claim 22, wherein the
holes are disposed in an orderly pattern in the frame.
25. The flat display apparatus as claimed in claim 22, wherein the
holes are disposed in a random pattern in the frame.
26. The flat display apparatus as claimed in claim 22, wherein each
hole formed in the frame has a size of 0.1 mm to 10.0 mm.
27. The flat display apparatus as claimed in claim 22, wherein the
thermal conductive sheet has one or more holes formed therein.
28. The flat display apparatus as claimed in claim 27, wherein each
hole formed in the thermal conductive sheet has a size of 0.1 mm to
5.0 mm.
29. The flat display apparatus as claimed in claim 27, wherein the
holes formed in the thermal conductive sheet are aligned with the
holes formed in the frame.
30. The flat display apparatus as claimed in claim 22, wherein the
display panel is a plasma display panel.
Description
[0001] This nonprovisional application claims priority under 35
U.S.C. .sctn. 119(a) on Patent Application Nos. 10-2004-0111122 and
10-2005-0014966 and 10-2005-0014967 filed in Korea on December 23,
and Feb. 23, 2005, the entire contents of which are hereby
incorporated by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a flat display apparatus,
and more particularly, the present invention relates to a flat
display apparatus which can prevent a misdischarge and enhance the
productivity.
[0004] 2. Description of the Background Art
[0005] In general, there are the various kinds of flat display
apparatuses such as the liquid crystal display (LCD), the field
emission display (FED), the organic electroluminescence display,
the plasma display and the like. Particularly, the plasma display
is a device in which, when an inert gas located between a soda-lime
glass front substrate and a rear substrate is discharged by a
high-frequency voltage, vacuum ultraviolet rays are generated, so
that a fluorescent substance or phosphor coated therein emits light
to display the image.
[0006] FIG. 1 is a view showing schematically a structure of a
background art plasma display apparatus. As shown in FIG. 1, the
plasma display comprises a case 110 including a front cabinet 111
and a back cover 112; a plasma display panel 120 for exciting the
fluorescent substance; a driving unit 130 including a printed
circuit board for driving and controlling the plasma display panel;
a frame 140 connected to the driving unit for radiating heat
generated when the plasma display apparatus is operated and for
supporting the plasma display panel; and a thermal conductive sheet
150 formed between the plasma display panel and the frame for
transmitting heat generated at the plasma display panel to the
frame.
[0007] The plasma display also includes a filter 160 formed by
adhering a film on a transparent glass substrate and provided at a
front side of the plasma display panel at a predetermined interval;
a finger spring gasket 170 supporting the filter and electrically
connecting the metal back cover and the filter; and a module
supporter 190 supporting the plasma display apparatus including a
filter supporter 180 and a driving apparatus.
[0008] A structure of the background art plasma display panel is
described in detail with reference to FIG. 2. In the plasma display
panel, a front substrate 200 and a rear substrate 210 are combined
in parallel with each other at a predetermined interval. The front
substrate is formed by arranging a plurality of sustain electrode
pairs, each of which includes a scan electrode 202 and a sustain
electrode 203, on a front glass 201 which is a display surface on
which the image is displayed. The rear substrate 210 is formed by
arranging a plurality of address electrodes 213 on a rear glass 211
acting as a rear surface. The address electrodes 213 and the
plurality of sustain electrode pairs 202, 203 cross each other.
[0009] In the front substrate 200, the scan electrode 202 and the
sustain electrode 203 each comprise a pair of electrodes. Each of
the pair of electrodes comprises a transparent electrode (a) made
of transparent ITO (indium tin oxide) and a bus electrode (b) made
of a metal. The scan electrode 202 and the sustain electrode 203
limit the discharge current and are covered with one or more upper
dielectric layers 204 which insulate the electrode pair. A
protective layer 205 on which magnesium oxide (MgO) is deposited is
formed on an upper surface of the dielectric layer 204 for easily
discharging.
[0010] In the rear substrate 210, stripe type (or well type) walls
212 are disposed parallel with each other for forming a plurality
of discharge spaces (that is, a plurality of discharge cells).
Also, a plurality address electrodes 213 which perform the address
discharge to generate vacuum ultraviolet rays are disposed parallel
with the walls 212. An upper surface of the rear substrate 210 is
coated with red, green and blue (R,G,B) fluorescent substances 214
emitting visible rays for displaying an image when the address
discharge is generated. A lower dielectric layer 215 is formed
between the address electrodes 213 and the fluorescent substances
214 for protecting the address electrodes 213.
[0011] A thermal conductive sheet is formed on a rear surface of
the plasma display panel for transmitting heat generated from the
plasma display panel, as shown in FIG. 3. The background art
thermal conductive sheet 310 is formed on a frame 320, and then is
adhered to a plasma display panel 330 having a front substrate 331
and a rear sheet 332. The thermal conductive sheet 310 makes the
frame 320 adhere to the plasma display panel 330, and transmits the
generated heat toward the frame 320 when the plasma display panel
330 is operated. Also, the frame 320 is adhered to the plasma
display panel 330 by the thermal conductive sheet 310 to support
the thermal conductive sheet 310 and radiate heat transmitted
through the thermal conductive sheet 310 toward the outside.
[0012] The background art thermal conductive sheet is formed with
the single sheet, and there is a drawback that the workability
becomes lower. That is, when the frame is adhered to the plasma
display panel by the single thermal conductive sheet, due to a
large surface area of the thermal conductive sheet, an adhesive
density between the thermal conductive sheet and the plasma display
panel is reduced to lower the workability. If the adhesive density
between the thermal conductive sheet and the plasma display panel
is reduced as described above, an air layer is partially formed
between the thermal conductive sheet and the plasma display panel.
Such an air layer reduces the thermal conductivity, and therefore
heat generated when the plasma display panel is operated cannot be
radiated effectively.
SUMMARY OF THE INVENTION
[0013] Accordingly, an object of the present invention is to solve
at least the problems and disadvantages of the background art.
[0014] An object of the present invention is to provide a flat
display apparatus which has an improved structure to enhance the
workability.
[0015] Another object of the present invention is to provide a flat
display apparatus which reduces the manufacturing cost.
[0016] Yet another object of the present invention is to provide a
flat display apparatus which can suppress a temperature gradient of
the flat display panel.
[0017] A flat display apparatus according to the present invention
comprises a display panel; a frame provided at a rear surface of
the display panel; and at least two thermal conductive sheets
located between the display panel and the frame, the thermal
conductive sheets being side-by-side and spaced apart from each
other.
[0018] Another flat display apparatus according to the present
invention comprises a display panel; a frame provided at a rear
surface of the display panel; and at least two thermal conductive
porous sheets located between the display panel and the frame, the
thermal conductive porous sheets being side-by-side and spaced
apart from each other, wherein an interval between the thermal
conductive porous sheets is 0.1 mm to 5.0 mm.
[0019] Yet another flat display apparatus according to the present
invention comprises a display panel; a frame provided at a rear
surface of the display panel, a first region of the frame having
one or more holes therein; and a thermal conductive sheet located
between the display panel and the frame, wherein the thermal
conductive sheet is located at the first region of the frame.
[0020] The present invention is advantageous in that the
workability can be enhanced by improving a structure of the flat
display apparatus. Also, the present invention is advantageous in
that the manufacturing cost can be reduced by improving a structure
of the flat display apparatus. In addition, the present invention
is advantageous in that a temperature gradient of the flat display
panel can be suppressed.
[0021] Further scope of applicability of the present invention will
become apparent from the detailed description given hereinafter.
However, it should be understood that the detailed description and
specific examples, while indicating preferred embodiments of the
invention, are given by way of illustration only, since various
changes and modifications within the spirit and scope of the
invention will become apparent to those skilled in the art from
this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The present invention will become more fully understood from
the detailed description given hereinbelow and with reference to
the accompanying drawings in which like numerals refer to like
elements, which are given by way of illustration only, and thus,
are not limitive of the present invention.
[0023] FIG. 1 is a view showing schematically a structure of the
background art plasma display apparatus
[0024] FIG. 2 is a view showing the background art plasma display
apparatus.
[0025] FIG. 3 is a view showing schematically a thermal conductive
sheet in the background art plasma display apparatus.
[0026] FIG. 4 is a view showing schematically a thermal conductive
sheet in a plasma display apparatus according to the first
embodiment of the present invention.
[0027] FIG. 5 is a view showing schematically a modified structure
of the flat display apparatus according to the first embodiment of
the present invention.
[0028] FIG. 6 is a view showing schematically a frame according to
the first embodiment of the present invention.
[0029] FIG. 7 is a view showing schematically another modified
structure of the flat display apparatus according to the first
embodiment of the present invention.
[0030] FIG. 8a and FIG. 8b are views for illustrating a structure
of the flat display apparatus according to the second embodiment of
the present invention.
[0031] FIG. 9a and FIG. 9b are graphs for illustrating the thermal
characteristic of the flat display panel according to the second
embodiment of the present invention.
DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS
[0032] Embodiments of the present invention will be described in
more detail with reference to the drawings.
[0033] A flat display apparatus according to the present invention
includes a display panel, a frame provided on a rear surface of the
display panel, and at least two thermal conductive sheets formed
between the display panel and the frame. The thermal conductive
sheets are spaced apart from each other at predetermined
intervals.
[0034] The thermal conductive sheets are smaller in size than the
display panel, so that edges of the thermal conductive sheets are
spaced from an edge of the display panel. In one embodiment, the
interval between the thermal conductive sheets is 0.1 mm to 5.0 mm.
Also, in one embodiment, the thermal conductive sheets have a
thickness of 0.1 mm to 2.0 mm.
[0035] The thermal conductive sheets are arranged in a longitudinal
direction or a widthwise direction of the frame. In one embodiment,
the thermal conductive sheet is a porous pad or porous sheet. The
porous sheet may contain a foaming agent, such as urethane foam.
The porous pad or the porous sheet silicon material. The frame, the
thermal conductive sheets and the frame have one or more holes
formed thereon.
[0036] Another flat display apparatus according to the present
invention includes a display panel, a frame provided on a rear
surface of the display panel, and two or more thermal conductive
sheets placed between the display panel and the frame. In one
embodiment, the thermal conductive sheets are spaced apart from
each other at an interval of approximately 0.1 mm to 5.0 mm.
[0037] Yet another flat display apparatus according to the present
invention includes a display panel, a frame provided on a rear
surface of the display panel, and a thermal conductive sheet formed
between the display panel and the frame. In one embodiment, the
frame has one or more holes formed thereon.
[0038] The thermal conductive sheet may be a porous pad or a porous
sheet containing a foam agent. The holes may be disposed regularly
or irregularly on the frame. In one embodiment, each hole formed on
the frame has a size of approximately 0.1 mm to 10.0 mm. The holes
are formed on a section of the frame on which the thermal
conductive sheet is placed. The thermal conductive sheet has one or
more holes formed thereon, having a diameter of approximately 0.1
mm to 5.0 mm. The holes formed on the thermal conductive sheet
correspond to the holes formed on the frame.
[0039] Hereinafter, a first embodiment according to the present
invention is described with referenced to accompanying
drawings.
[0040] FIG. 4 is a view schematically showing a thermal conductive
sheet in a plasma display apparatus according to the first
embodiment of the present invention. As shown in FIG. 4, a thermal
conductive sheet 430 of the flat display apparatus is formed on a
frame 420, and then adhered to a rear surface of a flat display
panel 410.
[0041] The flat display panel 410 includes a front substrate 411 of
a flat display apparatus such as a PDP, an LCD and the like, and a
rear substrate 412. An image is displayed on the flat display panel
410 when the flat display apparatus is operated. The frame 420
supports the flat display panel 410 and radiates heat generated by
the flat display panel 410 toward an outside when the apparatus is
operated.
[0042] One surface of the thermal conductive sheet 430 is attached
to the frame 420 and the other surface is attached to the flat
display panel 410. The thermal conductive sheet 430 acts as a
medium which transmits heat generated by the flat display panel 410
toward the frame 420 when the apparatus is operated. The thermal
conductive sheet 430 is formed as at least two unit sheets which
are spaced from each other at a particular interval.
[0043] As compared with the background art structure in which one
thermal conductive sheet is formed on the frame, if the plurality
of thermal conductive sheets 430 spaced apart from each other are
formed on the frame 420 and attached to the flat display panel 410
as described above, it is possible to work with the device easily,
so that an inferiority rate caused by a processing tolerance can be
reduced. Also, as compared with the background art structure in
which one thermal conductive sheet is formed on the frame, if a
plurality of the thermal conductive sheets 430 are formed on the
frame 420, a formation of an air layer between the frame 420 and
the thermal conductive sheets 430 can be effectively
suppressed.
[0044] In addition, in the background art structure, if the thermal
conductive sheet is attached to the frame in the state where the
thermal conductive sheet is not aligned with the frame, the entire
thermal conductive sheet should be removed from the frame. Contrary
to the background art structure, in the structure according to the
present invention, although the thermal conductive sheets 430 are
attached to the frame 420 in the state where one of the thermal
conductive sheets 430 is not aligned with the frame 420, only the
thermal conductive sheet 430 which is not aligned with the frame
420 can be removed. Therefore, the workability is made easier, and
it is possible to reduce a loss of the thermal conductive sheet 430
caused by an inferior alignment state, so that manufacturing costs
can be reduced.
[0045] Each edge of the thermal conductive sheets 430 attached to
the frame 420 is located inside of a corresponding edge of the flat
display panel 410 at a particular gap. As above, if the flat
display panel 410 has margins formed on an upper edge section, a
lower edge section and both side edge sections thereof, a
sufficient tolerance can be obtained when the thermal conductive
sheets 430 attached to the frame 420 are attached to the flat
display panel 410, so that the workability can be enhanced. A
detailed description on an interval between the thermal conductive
sheets 430 according to a feature of the present invention as above
will be described below with reference to the second
embodiment.
[0046] In order to sufficiently transmit heat generated at the flat
display panel 410 toward the frame, the thermal conductive sheets
430 may have a thickness of approximately 0.1 mm to 2.0 mm. The
thickness of 0.1 mm of the thermal conductive sheets 430 is a
minimum thickness for forming a sheet shape, and if the thickness
exceeds 2 mm, a thermal conductivity is lowered so that the thermal
conductive sheets 430 cannot sufficiently radiate the generated
heat toward the outside of the frame 420 when the flat display
apparatus 410 is operated.
[0047] The two or more thermal conductive sheets 430 are attached
to the frame 420 in one of a longitudinal direction or a widthwise
direction of the frame 420. The thermal conductive sheets 430 can
be made of metal with a high thermal conductivity; however, it is
preferable to use a thermal conductive tape or silicon and the like
for convenience of the assembly process.
[0048] FIG. 5 is a view schematically showing another structure of
the flat display apparatus according to the first embodiment of the
present invention, wherein a thermal conductive sheet 530 is formed
on a frame 520, and then adhered to a rear surface of a flat
display panel 510. The flat display panel 510 includes a front
substrate 511 of a flat display apparatus such as a PDP, an LCD and
the like, and a rear substrate 512. An image is displayed on the
flat display panel 510 when the flat display apparatus is
operated.
[0049] The frame 520 supports the flat display panel 510 and
radiates heat generated at the flat display panel 510 toward an
outside when the apparatus is operated. One surface of the thermal
conductive sheet 530 is attached to the frame 520 and the other is
attached to the flat display panel 510. The thermal conductive
sheet 530 acts as a medium which transmits heat generated at the
flat display panel 510 toward the frame 520 when the apparatus is
operated.
[0050] The frame 520 according to the first embodiment of the
present invention has one or more holes 540 formed thereon. The
holes 540 of the frame are formed on a section on which the thermal
conductive sheet 530 is formed. With this structure, when the
thermal conductive sheet 530 is attached to the flat display panel
510, any remaining air is exhausted through the holes 540 of the
frame 520, and so a formation of air layer can be effectively
suppressed.
[0051] A porous pad or a porous sheet is preferably used as the
thermal conductive sheet 530 so as to enable air remaining between
the flat display panel 510 and the thermal conductive sheet 530 to
flow toward the frame 520 through the thermal conductive sheet 530.
Since the porous pad or the porous sheet or the porous sheet makes
the remaining air pass toward the frame 520 and absorbs a noise and
a vibration, the porous pad or the porous sheet prevents the noise
and vibration generated when the flat display panel is operated 510
from being transmitted to the frame 520. In order to absorb the
noise and vibration generated in the flat display panel 510, the
porous pad or the porous sheet is made of porous material with a
low density and a low hardness.
[0052] The porous pad may be made by mixing urethane foam with
silicon material and then applying an adhesive on front and rear
surfaces of the manufactured pad, so that the porous pad or the
porous sheet is obtained. Thus, due to the urethane foam, a
plurality of porosities are formed in the silicon of the pad. Acryl
material may be used as the adhesive applied on the front and rear
surfaces of the pad. In the porous pad or the porous sheet, a
content rate of the silicon is approximately 89%, a content rate of
the urethane foam is approximately 10%, and a content rate of the
adhesive is approximately 1%. Air remaining between the flat
display panel 510 and the thermal conductive sheet 530 flows
through the porosities formed by the urethane foam, and the pad
having the porosities absorbs the noise and vibration transmitted
to the frame 520. Also, heat which is generated when the flat
display panel 510 is operated, is transmitted to the frame 520
through the silicon contained in the porous pad or the porous
sheet. Because of the porosities of the porous pad or the porous
sheet, the porous pad or the porous sheet absorbs external shock.
Additional details concerning an embodiment of the porous pad or
the porous sheet may be found in copending application Ser. No.
10/612,874, the entire contents of which are hereby incorporated by
reference thereto.
[0053] FIG. 6 is a view schematically showing a frame according to
the first embodiment of the present invention.
[0054] As shown in FIG. 6, a frame 600 according to the first
embodiment of the present invention has a plurality of holes 610
formed thereon. In general, when the thermal conductive sheet 530
is attached to the flat display panel 510, an air layer is not
formed on only specific areas, but is formed irregularly on the
entire surface. In order to suppress a formation of an irregular
air layer or to remove an air layer which is already formed, the
holes 610 are formed on a section of the frame 620 on which the
thermal conductive sheet 530 is formed. At his time, the holes 610
are disposed regularly at regular intervals or disposed irregularly
on the frame 600.
[0055] A shape of each hole 610 of the frame 600 can be any one of
a circular shape 611, an elliptical shape, a rectangular shape 612
or a lozenge shape. That is, it is possible to modify a shape of
the holes 610 of the frame 600 according to a convenience and a
need of the manufacturer.
[0056] At this time, a size (diameter or height/width) of the hole
610 is above 0.1 mm, taking a processing tolerance into
consideration, and is below 10.0 mm, taking into consideration a
mechanical strength and a heat-radiating efficiency of the frame
600.
[0057] On the other hand, although air can be sufficiently
exhausted through the structure of another flat display apparatus
according to the first embodiment of the present invention, air can
be exhausted more effectively in a structure of yet another flat
display apparatus according to the first embodiment of the present
invention described below.
[0058] FIG. 7 is a view schematically showing another structure of
the flat display apparatus according to the first embodiment of the
present invention, wherein a thermal conductive sheet 730 is formed
on a frame 720, and then adhered to a rear surface of a flat
display panel 710.
[0059] The flat display panel 710 includes a front substrate 711 of
the general flat display apparatus such as the PDP, the LCD and the
like, and a rear substrate 712. An image is displayed on the flat
display panel when the flat display apparatus is operated. A frame
720 supports the flat display panel 710 and radiates heat generated
at the flat display panel 710 toward an outside when the apparatus
is operated.
[0060] One surface of the thermal conductive sheet 730 is attached
to the frame 720 and the other is attached to the flat display
panel 710, so that the thermal conductive sheet 730 acts as a
medium which transmits heat generated at the flat display panel 710
toward the frame 720 when the apparatus is operated.
[0061] Yet another thermal conductive sheet 730 according to the
first embodiment of the present invention has one or more holes 740
formed thereon, and at least one or more holes 750 are formed on
the frame 720. The holes 740 formed on the thermal conductive sheet
730 are matched with the holes 750 formed on the frame 720,
respectively. By matching the holes 740 of the thermal conductive
sheet 730 with the holes 750 of the frame 720, the remaining air is
exhausted through the holes 740 of the thermal conductive sheet 730
and the holes 750 of the frame 720 matched with the holes 740 of
the thermal conductive sheet 730 when the thermal conductive sheet
730 is attached to the flat display panel 710.
[0062] Also, thermal conductive sheet 730 is made of the porous
material so that air can be effectively exhausted through the
thermal conductive sheet 730 itself and the holes 740 of the
thermal conductive sheet 730.
[0063] A size (diameter or width/height) of each hole 740 of the
thermal conductive sheet 730 is 0.1 mm to 5.0 mm. The minimum size
of the hole 740 is 0.1 mm, taking into consideration the processing
tolerance, and 5.0 mm is a maximum size of the hole 740, taking
into consideration that the thermal conductive sheet 730 at a
portion on which the hole 740 is formed is decreased. A size
(diameter or width.times.height) of each hole 750 of the frame is
0.1 mm or more, taking into consideration the processing tolerance,
and is 10.0 mm or less, taking into consideration a mechanical
strength and a heat radiating-efficiency of the frame 720.
[0064] Also, air is exhausted smoothly by matching the holes 750 of
the frame 720 with the holes 740 of the thermal conductive sheet
730. The number of holes 750 of the frame 720 is preferably the
same as the number of holes 740 of the thermal conductive sheet
730, and so an efficiency of the frame 720 can be increased.
[0065] A support bracket (not shown) and a mount (not shown) may be
provided on a rear surface of the frame 720 for supporting and
fixing the flat display apparatus. A formation of air layer can be
suppressed by forming the holes 750 at a section of the frame 720
adjacent to a section on which it is difficult to form the
hole.
[0066] Hereinafter, a second embodiment is described with
referenced to accompanying drawings. FIG. 8a and FIG. 8b are views
for illustrating a structure of the flat display apparatus
according to the second embodiment of the present invention. FIG.
8a is a view schematically showing that a thermal conductive sheet
830 formed on a frame 820 is adhered to a flat display panel 810,
and FIG. 8b is a side view showing the thermal conductive sheet 830
placed between the flat display panel 810 and the frame 820.
[0067] Referring to FIG. 8a and FIG. 8b, a thermal conductive sheet
830 of the flat display apparatus according to the second
embodiment of the present invention is formed on a frame 820, and
then adhered to a rear surface of a flat display panel 810.
[0068] The flat display panel 810 includes a front substrate 811 of
the general flat display apparatus such as a PDP, an LCD and the
like, and a rear substrate 812. An image is displayed on the flat
display panel 810 when the flat display apparatus is operated. The
frame 820 supports the flat display panel 810 and radiates heat
generated at the flat display panel 810 toward an outside when the
apparatus is operated.
[0069] One surface of the thermal conductive sheet 830 is attached
to the frame 820 and the other surface is attached to the flat
display panel 810 The thermal conductive sheet 830 acts as a medium
which transmits heat generated by the flat display panel 810 toward
the frame 820 when the apparatus is operated. The thermal
conductive sheet 830 contains a plurality of sheets, which are
spaced apart from each other at certain intervals.
[0070] When two or more thermal conductive sheets 830 are formed at
certain intervals, the workability is enhanced, a formation of the
air layer is suppressed and a manufacturing cost is reduced. The
description is omitted since the description thereof has been set
forth above regarding the first embodiment of the present
invention.
[0071] As shown in FIG. 8b, since the thermal conductive sheet 830
is not formed on a space section 840 between the thermal conductive
sheets 830, if the flat display apparatus is operated for long
time, heat generated at the flat display panel 810 cannot be
transmitted sufficiently toward the frame 820. In particular, in
proportion to a width of the space section 840, a temperature
gradient is generated excessively on the flat display panel 810
matched with the space section 840 on which the thermal conductive
sheet is not formed. Due to the temperature gradient, the
misdischarge is generated in the flat display panel 810 when the
flat display apparatus is operated.
[0072] That is, when a width of the space section 840 is narrow,
there are drawbacks that the workability becomes lower and an
occurrence ratio of an air layer is increased since it is difficult
to exhaust air when the thermal conductive sheets 830 are adhered
to the flat display panel 810. On the other hand, when a width of
the space section 840 is wide, the misdischarge is induced due to
the temperature gradient of the flat display panel 810.
[0073] In the second embodiment of the present invention, it is
desirable that a width of the space section 840 between the thermal
conductive sheets 830 is 0.1 mm to 5.0 mm. A minimum interval of
0.1 mm takes into consideration the processing tolerance, and a
maximum interval of 5.0 mm is an interval at which the misdischarge
caused by the temperature gradient of the flat display panel 810
can be prevented.
[0074] Also, in the second embodiment of the present invention, the
thermal conductive sheets 830 are formed such that an interval
between an edge of the each thermal conductive sheet 830 and an
edge of the flat display panel 810 is 0.1 mm to 5.0 mm. A minimum
interval of 0.1 mm takes into consideration the processing
tolerance, and a maximum interval of 5.0 mm is an interval at which
the misdischarge caused by the temperature gradient of the flat
display panel 810 can be prevented.
[0075] Preferably, an interval between an edge of the each thermal
conductive sheet 830 and an edge of the display area of the flat
display panel on which an image display is displayed when the flat
display apparatus is operated is preferably 5 mm or less. Thus, a
manufacturing cost of the thermal conductive sheet 830 can be
saved.
[0076] Also, a thickness of the thermal conductive sheet 830 is
preferably 0.1 mm to 2.0 mm, and the misdischarge caused by the
temperature gradient is not generated in the flat display panel 890
when the space section 840 between the thermal conductive sheets
830 is 5.0 mm or less. That is, relating to a width of the space
section 840 between the thermal conductive sheets 830, a thickness
of the thermal conductive sheet 830 acts as a factor which
influences the temperature gradient. A minimum thickness of 0.1 mm
takes into consideration the processing tolerance, and 5.0 mm is a
maximum thickness at which an acceptable temperature gradient is
generated. A thermal conductivity of the entire thermal conductive
sheet 830 with a thickness of 2 mm is significantly reduced, thus
the temperature gradient is generated if a width of the space
section 840 between the thermal conductive sheets 830 is 5.0 mm or
less.
[0077] FIG. 9a and FIG. 9b are graphs for illustrating the thermal
characteristic of the flat display panel according to the second
embodiment of the present invention. The x axis in FIG. 9a
indicates each position in a widthwise direction of the flat
display panel, and the y axis indicates a temperature measured at
each position of the flat display panel. Two thermal conductive
sheets 830 are formed on the frame 820, and a certain interval
between the two thermal conductive sheets 830 is formed at a
section from which the zero point is spaced apart at 0.35 m. The
curves indicate changes of the temperature at the position at which
the interval between the thermal conductive sheets is 0.1 mm, 5.0
mm and 10.0 mm, respectively.
[0078] The x axis in FIG. 9b indicates each position in a widthwise
direction of the flat display panel, and the y axis indicates a
temperature measured at each position of the flat display panel.
Three thermal conductive sheets 830 are formed on the frame, and
certain intervals between two thermal conductive sheets 830 are
formed at a section from which the zero point is spaced apart at
0.35 m and 0.65 m. The curves indicate changes of the temperature
at the position at which the interval between the thermal
conductive sheets is 0.1 mm, 5.0 mm and 10.0 mm, respectively.
[0079] As shown in FIG. 9a and FIG. 9b, in proportion to the
interval between the thermal conductive sheets, a temperature at a
section of the flat display panel corresponding to the interval
between the thermal conductive sheets is increased. When the
interval between the thermal conductive sheets is 5.0 mm or less, a
misdischarge caused by the temperature gradient is not
generated.
[0080] As described above, in one embodiment of the present
invention, the thermal conductive sheet is placed between the flat
display panel and the frame, the thermal conductive sheet is
divided into two or more sheets, and the interval is formed between
the thermal conductive sheets. With this, a process for forming the
thermal conductive sheet is easily performed, a formation of air
layer can be suppressed and a manufacturing cost can be
lowered.
[0081] Considering that the air layer is widely generated when the
interval between the thermal conductive sheets is narrow and a
uniformity of temperature of the flat display panel deteriorates
when the interval between the thermal conductive sheets is wide, it
is desirable that the interval between the thermal conductive
sheets is 0.1 mm to 5.0 mm. In the above limitation of the
interval, it is preferable that the thickness of the thermal
conductive sheets is 0.1 to 2.0 mm, and a material of the thermal
conductive sheets and a direction in which the thermal conductive
sheet is formed are not limited.
[0082] The invention being thus described, it will be obvious that
the same may be varied in many ways. Such variations are not to be
regarded as a departure from the spirit and scope of the invention,
and all such modifications as would be obvious to one skilled in
the art are intended to be included within the scope of the
following claims.
* * * * *